Remove white spaces.

https://bugzilla.gnome.org/show_bug.cgi?id=733211
Move calls from Mahjongg() to startup().

https://bugzilla.gnome.org/show_bug.cgi?id=733211
Cosmetic move of code.

https://bugzilla.gnome.org/show_bug.cgi?id=733211
Add --version command-line option.

https://bugzilla.gnome.org/show_bug.cgi?id=733211